package Uinterface;

 /* FixedLengthDocument.java */
 
 import javax.swing.*;
 import javax.swing.text.*;
    
 public class FixedLengthDocument extends PlainDocument
 {
     private int iMaxLength;
  
     public FixedLengthDocument(int maxlen) {
         super();
         iMaxLength = maxlen;
     }
 
     public void insertString(int offset, String str, AttributeSet attr)
                     throws BadLocationException    {
         if (str == null) return;
 
         if (iMaxLength <= 0)        // aceitara qualquer no. de caracteres
         {
             super.insertString(offset, str, attr);
             return;
         }
 
         int ilen = (getLength() + str.length());
         if (ilen <= iMaxLength)    // se o comprimento final for menor...
             super.insertString(offset, str, attr);   // ...aceita str
         }
 }
